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<h4 class="heading"><span class="type">Paragraph</span></h4>
<p>The unit step function is defined by</p>
<div class="displaymath process-math" data-contains-math-knowls="">
\begin{equation*}
u_c(t)=\begin{cases}
0,\quad t&lt;c,\\
1,\quad t \geq c.
\end{cases}
\end{equation*}
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<p class="continuation">The graph of <span class="process-math">\(y=u_c(t)\)</span> is given in Figure <code class="code-inline tex2jax_ignore">[cross-reference to target(s) "Fig1_1" missing or not unique]</code>.</p>
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